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   "source": [
    "# Preliminaries\n",
    "\n",
    "## Installation\n",
    "\n",
    "不需要安装, anaconda 安装后的 `base` 环境有该包, 或者自己创建环境时, 用包管理工具安装(比如: `conda`) \n",
    "\n",
    "此外, 如果是运行在 `jupyter` 中, 运行的结果会用 $\\latex$ 渲染. "
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 1,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/latex": [
       "$\\displaystyle \\int e^{x} \\cos{\\left(x \\right)}\\, dx = \\frac{e^{x} \\sin{\\left(x \\right)}}{2} + \\frac{e^{x} \\cos{\\left(x \\right)}}{2}$"
      ],
      "text/plain": [
       "Eq(Integral(exp(x)*cos(x), x), exp(x)*sin(x)/2 + exp(x)*cos(x)/2)"
      ]
     },
     "execution_count": 1,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "from sympy import *\n",
    "x = symbols('x')\n",
    "a = Integral(cos(x)*exp(x), x)\n",
    "Eq(a, a.doit())"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "# Words\n",
    "| 英文 | 词性 | 中文 | \n",
    "| - | - | - | \n",
    "| evaluate | v. | 估计;评价;评估 | \n"
   ]
  }
 ],
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